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Pipe bursting to remove a belly.

I wanted to wait till I had achieved success till I posted this trick. If a belly is under 12ft and holding 1/2 water to the spring line. You can use a larger head in this case 6" on a 4" line. But pull in 4" pipe. The 6" head really pushes the old pipe outward and compacts the soil. The belly was about 7 feet and it is gone now. Will it return as the earth settles? Who knows just giving out the information. If it didn't work I was fully prepared to pull in a 6 inch line and upsize the sewer. That is the cool thing that bursting can do is upsize the line.

Will you be monitoring this over time to see how the technique holds up to settling?
I'd be curious what it does several years from now...
As you probably are as well...

On this job they are on a tight budget and lining may be needed so I might be back to look later on but don't know for sure. I would like to go back in a year or so. I should also mention that we flooded the work area with water to really moisten up the soil and posistioned the pull cable at the bottom of the pipe to pull in as low as possible thinking it would drop the whole line down. Everybody wants pipe lining but I trully believe that hdpe is the toughest pipe out there and makes a 100 year solution to sewer problems.

That transition fitting in the pic we are using on a special project where we needed a couple of 6" combos for C.O.'s at the upstream end. Then the pvc will connect to the 6" clay that is not being replaced. Probably Ferncos with the stainless sleeve. Then concrete.

I'm very curious about the purpose of the lime. I am guessing it eliminates future root growth.

That transition fitting in the pic we are using on a special project where we needed a couple of 6" combos for C.O.'s at the upstream end. Then the pvc will connect to the 6" clay that is not being replaced. Probably Ferncos with the stainless sleeve. Then concrete.

I'm very curious about the purpose of the lime. I am guessing it eliminates future root growth.

Yea it's suppose to make the roots go elswhere and since there are no more joints to go to we just brush it on and then do fabric around the joint. Does it really need it I dunno it's cheap takes 2 seconds and if it helps I feel I did the best job we could.

The Following User Says Thank You to Cuda For This Useful Post:

What are your soils like? The little bit of bursting I've been involved with here did not go real well. Our soils are so rocky they don't move much (or so I was told) and they had a lot of trouble trying to upsize a line. Ended up digging up so many spotds they might as well have just dug all of it.

What are your soils like? The little bit of bursting I've been involved with here did not go real well. Our soils are so rocky they don't move much (or so I was told) and they had a lot of trouble trying to upsize a line. Ended up digging up so many spotds they might as well have just dug all of it.

I think we have everything lol! Sand (yay, easy) clay, glacial till, rocks big and small. Maybe the water table and rain play apart here. I have heard of other people in hot climates having to use super high pressures to do the same pipe size and length that we do.